Due to lack of time we didn't get to connect the batteries at the workshop building the Benjolin, so the circuitboards were tested with Rob's optional In/out board.

I soldered the battery holders myself later, but made a mistake. So my Benjolin got hot and smelly, I hope it still works.

Here's how it should/could be done (if you do not have the female header connectors that could also be used and make it look more slick)

Looking at the solderside the voltageconverter transistors are at the upper right corner. The left of these is for -9V, the one to the right provides +9V.

The + and - 9 volt voltage regulators need 2-3 volts surplus to work properly so at he header side you could use 12-15 volts.

Batteries need to be connected at the output of the regulators, here two male headers (connectors) are available at the circuitboard.

I included a JPG to indicate how to connect batteries if you do not use the female connectors for the battery headers. Note: the black wire of the + voltage and the red wire of the - voltage battery go to ground.

It's likely that an IC has been damaged or at best, very degraded. I was very suprised that the kits did not come with sockets so that easy IC changes could be made for such misshapes. For an extra buck or two, it would have saved lots of desoldering at the workshop. I to purchased a Benjolin but will socket all the IC's.

Thanks for saving someone else the grief you went through by clarifying the battery connections

Seeing as I didn't know what a Benjolin was I did a search and found the site - looks interesting!

One thing I noticed from the picture was that the ICs don't all face the same way! That is always a dangerous way to go... especially without sockets. I always provide sockets with workshop orientated kits otherwise people are bound to make mistakes!

You cannot post new topics in this forumYou cannot reply to topics in this forumYou cannot edit your posts in this forumYou cannot delete your posts in this forumYou cannot vote in polls in this forumYou cannot attach files in this forumYou can download files in this forum

Please support our site. If you click through and buy from our affiliate partners, we earn a small commission.